As Kosawa aged, his condition worsened. The horns clustered on his limbs, where the body temperature is lower. They grew at a rate of 5 millimeters a month. Warts that looked like barnacles began to ...

The exact cause of cutaneous horns is not well understood, but they can form over different types of underlying skin lesions, which may be benign, precancerous, or malignant. Usually, surgeons ...